Incandescent xamp



.- Dec. '22, 1925- F. J. LAUTE-RQACHA INCANDESCENT' AMP. j Fil ed A ril121, 1919:.

INVENTOR 'fhdenck (Mad/Mm BY shock of a blow given in any plane.

Patented 51)... 22, 19,25.

UNITED" STATES,

OFFIC FREDERICK J'OHN'LAUTERIBACH, or BROOKLYN, NEw 'Yonx, Assrenon TOwns'rrne- HOUSE LAMP compan A CORPQRATION or rnnnsyrvama.

mcannnscnnrh nAMr.

' To all whom it may concern: I

, Be it known that I, FREDERICK J OHN LAUTERBAOH, a citizen of theUnited States, and a resident of Brooklyn, in the county of 5 Kings andState of New York, have invented a new and useful Improvement inIncandescent Lamps, of which the following is a specification. Thisinvention relates to the construction of a rugged type incandescent lampand particularly to an improved means for re? siliently supporting thefilament.

tungsten lamp is applied, which subject the lamp to excessive vibration,such as when usedon street cars and battleships, in factory buildings,etc. This vibration produces strains in the mount carrying the fila?ment which strains quite frequently cause an entanglement of adjacentstrands of the file-- ment, thereby changing the efiiciency of the lampor effecting its failure, and in the case of severe shocks the glassarbor, supporting the filament, is fractured. It is obvious that thesestrains are in every direction and, un-

less some shock absorbing means is provlded,

an early failure of the lamp may be predicted fromthe above and otherreasons; p

It is an object of the invention to provide a mountin for the filamentcapable of with standing 1; e stresses produced in any direction. Incarrying thisobject into effect I resiliently support the usual glassarbor, said support being designed to absorbcthe junctively with t isresilient support I .use

,a special form of winding which has a tendency to positively maintainthe adjacent strands of filament separate from each other.

In some ty es of rugged lamps, it is desirable to limit the vibration ofthe filament mount in the direction of the leading-in wires for thereason that the leadin -in .the lament mount, do not vibrate with equalfreedom, and this very often results in the breaking ofi' of theleading-in wires from The special object of the invention is to providea shock absorbing means which will retard the vibration of the filamentmount in a plane parallel to the plane drawn form of my invention; Fi 2is an eleyation There are many uses to which the present or buttonformed near'each end 'of'the arbor; 5

wires l being comparativelymore rigid t an 'pendicular to theaxiallineofthe loops and Application filed April 21, 1919. Serial'No.291,738.

through the longitudinal axis of the leadingin wins Other objects of theinvention will mani fest themselves upon a reading'of the followingdescription. I

Throughout the several views of the accompanying drawings similarreference characters refer to like parts.

In the drawings, Fig. 1 illustrates an elevation of a lamp mountembodying one the leading-in wires 2 are sealed, the inner ends thereofbeing connected with terminal strands of thejfiljfniiti3. Ihe filament 3is supported upon'aaihdnnt 4 comprised ofa glass arbor 5j-havin flaseries of radially disposed hooksin'sertedintoan enlargement The arbor5- is-joined to the ress -1 by means of a connectin member or link' 6,having its T ends imbedde intothe stem, land arbor 5.

The link6 may be of any formation, whichjfi? will be more shockabsorbingthan a straight--- member of like material and not provided withweakened portions designed to ave unequal shock resisting propertieseither axial-,

1y -or radially. .I have illustrated several forms which the link 6 maybe given, the preferred one being shown in Figs. 1 and 2." This styleoflinkmay consist of one or more closed loops formed intermediate the endsof a length of resilient material such as pianowire. Theends of-the linkfiext'end in opposite directionsand areinserted into the adjacent, glasselements so as tobe' in the axial line of both the bulb and the fila-.ment mount. J f r ,z'

From an inspection ofthe drawings, it will be apparent that when thelink 6 is provided with one or moreclosed'loops the greatest; lateralresiliency-will be in a direction perthe arbor, thusa vibration of thearbor will IOQ jar will tend to vibrate the arbor in a predetermineddirection, namely, in the path of least resistance. will, therefore, bean oscillatory one about the axis of the loops.

Owing to the relatively large radius of the loops with respect to thediameter of the wire of which it is composed, the'link may be constantlydistorted without over-reaching the elastic limit of the metal, thuslong service is possible since the metal is not fatigued and weakened toany appreciable degree. The leading-in wires as illustrated, are bent toangular form. One leg of each of the leading-in wires may be positionedin a common plane, substantiallyv perpendicular to the axial line of thelink. The other legs of the leading-in wires may be positioned in aplane substantially parallel to the axial line of the link. The freeends of the leading-in wires connect with the terminals of mony, thedistance between the ends of the leading-in wires and the supports uponwhich the leading-in wires are disposed will vary anda stress will beimparted to the filament. The angular construction of the leading-inwire provides a compound pivot and it may move about the .pointadjacentthe stem and about the apexof its angle.

The looped link in combination, therefore, with the angular leading-inwires, provides a construction which greatly relieves stresses on andreduces the possibility of rupture-of the filament.

The form of link illustrated by Fig. 3 hasasubstantially closed loopintermediate its ends and may be flattened on opposite sides so as to beof less thickness in one direction than in another, 'as clearlyillustrated by an enlarged end view. In this figure the loop is formedwith the flattened surface on the inside, thus adding to the resiliencyof the link when absorbing a shock received in a plane substantiallyparallel to that of the loop, and being more rigid when vibrated in aplane other than parallel to that of the said loop. Accordingly, whenthe form of link illustrated by Fig. 3 is employed, if mounted in such amanner that its loop is in a plane parallel to the planes in which eachof the leading-in wires 2 are disposed, it'has the same tendency toretard the vibration of the arbor in a directiozrperpendicular to theplanes of said leading-in wires, as is characteristic of the link shownin Figs. 1 and 2.

The movement of the arbor The modification of the link shown in Fig. 4contemplates the formation of three open loops positioned substantially120 apart, and arranged one above another while Fig. 5 illustrates asomewhat similar formation consisting of two loops separated 180,

If desired, the link 6 may comprise a.

item in that it must have special resiliency and strength to withstandthe'shocks absorbed by it for a period equal to the present life of acommercial lamp. If the wire from which the link is made is too springyor elastic, it will have a short'life, whereas, on the other hand, if itis too rigid, it will fail to function properly. The cross-sectionalarea is another important factor to be taken'into consideration inselecting a material or wire from which the link 6 is to be made, as thelink must be inserted in the glass when in a plastic condition and theamount of heat absorbed by the metal comprising the link is liable tochange the temper thereof and destroy.-its;-'resilient-property. I havefoundthatipiano wire" of from 24 to lid-mils." in diameter is the mostsuitable'for lamp of the smaller wattages, i. e., 25 to 50 Watts. It isobvious that the general design of the link as to lengthfdiameter, andnumber of loops will vary with the size of lam I in the link is used.

In Fig. :I' have, illustrated a form of winding which has proved veryeffective for maintaining the adjacent strands of the filament separate,especially when used in com- .blnation witha shock absorbing link suchas contemplated by my invention. In this form of winding, the filamentis first attached to one of the leading-in wires, and it is then led toone of the upper hooks immediately thereabove, taken over to theadjacent hook ofthe same series, and brought downward to the hook of thelower series that is in alignment with the last mentioned upper hook.The filament is then wound over the adjacent hook of the lower seriesand brought back to a top hook, the method of winding being the same forthe remaining hooks as just described. The filament after being strungupon the hooks has its free end secured to the other leading-inwire,'which completes the winding operation.

' While this invention has been set forth in certain preferredembodiments, it will be Leeaeae resilient support member joining saidstem and arbor, said link being shaped to looped form between said stemand arbor, the loop.

being positioned with its axial 'line substantially at right angles tothe. axis of the arbor.

. 2. An incandescent lamp'comprising an' arbor having a filamentsupported thereon,

a resilient supporting member connecting said stem and said arbor, aloop intermediate the ends of said member, said ends being disposed uponthe longitudinal axial line of said arbor and the axis of said helixbeing substantially at right angles to said axial line.

3. An incandescent lamp comprising a stem, an arbor, a resilientsupporting member disposed substantially on the longitudinal axis ofsaid lamp connecting said arbor to said stem, a filament supported onsaid arbor, relatively-rigid leading-in wires embedded in said stem andhaving the ends thereof connected to the terminals of said filament anda helix in said'resilie nt member having the I axis thereofsubstantially at right angles to the portions of said leadingin wiresconnected to said filament.

4. An incandescent lamp comprising a stem, an arbor, a resilient membercomprising a helix terminating in straight portions,- said-portionsbeing connected with said stem and arbor and positioned coincident withthe longitudinal axisof the lamp, a filament supported on said arbor,"leading-in wires embedded in said stem and having their ,free endssecured to the terminals of said filament, said leading-in wires beingbent to, position' a portion of'their length adjacent to their exposedends in parallel relation to the axial line" of said arbor said loop. insaid re silient member having the axial line thereofsubstantiallyat'right angles to the longitudinal axis of said portionsof said leading-in wires. '5. An "ncande scent lamp comprising a stem,an arbor having a filament supported thereon, leading-in wires embed dedin said stem and. connected to the terminals of said filament, sa idleadingin Wires having a portion of their length 65 parallel to andportion of their length at right angles to the-axial line of said arbor,a resilient supporting member having an end thereof",embedded in :saidstem and an end embedded in said arbor, ahelix in said member disposedintermediate saidends and having the axis thereof sub-- stantially atright angles to the axial lid of the arbor. '7 i 4 In testimony whereof,I have hereunt subscribed my name this 10th day of Apri 1919.

FREDERICK JOHN LAUTERBACH.

